Disk sharpener



' Sept. 13,1927. 1,642,004

J. C. ZUMWALT DISK SHARPENER Filed A112;- 1926 I o 7 /5 fl 7- gwuentoz /7' cfazumwalf Patented Sept. 13, 1927.

UNITED .[STATES PAT NT CE 1 iosnrfi c. z 1viwiiLr, -or, oLAY CENTER, lee-Balm, l;

, p ss sur ame Application filed August 19, 1926; Serial no. 130,326. I

This invention relates to neweanduseful improvements in sharpening devices, andparticularly to sharpening" devices for the disks of agricultural implements such was:

harrows, cultivators, and the'like.

The principal object of the invention is to position for sharpening each of the disks in successlon.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the drawing:

Figure 1 is a top plan view of a portion of a disk cultivator, showing the invention in sharpening position with relation to one of the disks.

Figure 2 is a Vertical sectional view, on the line 2-2 of Figure 1, showing the invention in elevation.

Figure 3 is a transverse sectional view, on

the line 33 of Figure 1, looking toward the sharpening disk.

Figure 4 is a perspective view of another form of sharpening disk, which is octagonal in outline.

Figure 4 is a similar view of a further form which is square in outline.

Referring particularly to the accompanying drawing, 10 represents a portion of the frame of a disk cultivatorhaving disks 11 properly mounted thereon, and in connection with which the present in ention is used.

The invention includes an elongated bar 12 having a hook 13 on one end. Slidable longitudinally on the bar is a sleeve 14, and formed on one side of the sleeve is an arm 15, said arm being spaced a short distance away from the edge of the bar. Disposed through the arm is a bolt 16, and mounted on the bolt, between the arm and the edge of the bar, is a metal sharpening disk 17,

such disk being shown in circular form in Fi res 1 to 3, inclusive, and as octagonal 1n %igure 4, and square in Figure 5. The edge portion ofthe disk 17 overlaps the edge of the bar a short distance, as clearly seen in the top plan view Figure '1, wherebythe peripheral edge of the disk cooperateswith the adjacent side face of the bar to formi a wedge opening into which the edge portion of the cultivator disk is adapted to move, while said disk is in rotation. A nut 18 is engaged on the other end of the bolt 16 to hold the disk 17 against rotation. The hook end of the bar is engaged around the axle or shaft of the disk to be sharpened, as shown in the drawing, and a strong length of timber, or a metal pipe 10 placed across the frame of the cultivator, on which the other end of the bar 12 is adapted to rest. The device is so positioned that the edge of the cultivator disk lies within the angle between the sharpening disk 17, and the adjacentface of the bar 12. The machine is then driven forwardly for a distance approximately fifty or a hundred yards, with the result that the edge of the cultivator disk will be properly sharpened against the peripheral face of the disk 17. When one disk has been sharpened, the device is removed and replaced in the same relation to the next disk, and the machine moved the proper distance to produce the required sharpening of the disk. The above operation is continued until all of the cultivator disks have been sharpened. When the disk 17 shows signs of becoming dull, the operator loosens the nut 18, and rotates the disk a short distance to expose an unused portion of the peripherythereof for action upon the edge of'a cultivator disk.

Ordinarily, in disk harrows or disk cultivators, the disks are arranged in gangs, with the concave sides of the disks of each gang disposed toward the outside of the machine.

The operation above described applies to the disks of one gang, but when the disks of the other gang are to be sharpened, the sleeve 14 is removed and reapplied to the bar 12, in

reverse position, that is with the disk 17 extending from the other side of the bar, and arranged therebelow. This is made necessary to permit the disk 17 properly engaging the edges of the other disks. A set screw 19 is engaged through the sleeve 14, and into biting engagement with the bar, whereby to properly hold the sleeve so that the disk 17 will be disposed in the desired relation to the edge of the cultivator disk.

While I have illustrated the disk sharpening disk as having its'sharpening edge arranged at right angles to the planes of the side faces thereof, I Wish it understood that such sharpening edges may he beveled to present a smaller sharpening face to the edge of the cultivator disk.

The bar 10 is suspended from the frame by the chains 11, whereby to support the Weight of the bar 12, and to prevent sagging of the bar 10.

What is claimed is:

An agricultural disk sharpener comprising a flat bar having a hook on one end lying in the plane of the bar, a sleeve slidable on the bar liming a terminally apertured arm formed on its upper side and extending transversely of the upper edge of the bar and thence longitudinally in parallel relation to the bar, means for adjustably maintaining the sleeve at different positions on the bar, and a sharpening element disposed transversely beneath said arm, and clamping means through the aperture of the arm and through the sharpening element, a portion of the periphery of the sharpening element overlapping the upper edge of said bar.

In testimony whereof, I allix my signature. v

JOSEPH C. ZUMWALT. 

